"""File:     running_sum.py
   Purpose:  Add a collection of user input numbers

   Run:      python running_sum.py

   Input:    A sequence of numbers, one per line of input, 0 terminates
             input
   Output:   The sum of the numbers
"""
sum = 0.0
number = float(raw_input("Enter the first number (0 to quit)\n"))
while number != 0:
   sum = sum + number
   number = float(raw_input("Enter the next number (0 to quit)\n"))

print "The sum of the input values is", sum